This Week's Most Popular Stories Concerning Mazda 6 Key Fob Changing the Battery in Your Mazda 3 Key Fob

There is nothing more frustrating than getting in your car after a long and tiring day and discovering that your key fob battery is dead. Fortunately, it is simple to fix it with simple battery replacement from the hardware store or big box retailer.

Incorporating a spare key fob to your Mazda 3 can be an affordable way to keep yourself from having to be taken to the dealer and having them re-program your keys.

Battery Replacement

You can change the battery on your Mazda 3 keyfob at home. But, you should only replace the battery when it goes out of service, or if the key fob displays a message on the multi-information display that reads, "Low key fob battery. Replace battery."

To open the key fob's case you'll need a tape-wrapped flathead screwdriver as well as some patience. Locate a notch or gap in the bottom metal part of the Mazda 3's key fob and then insert the head of the screwdriver to pry off the lower portion. Repeat the procedure for the top metal piece however, be careful not to scratch the rubber ring at the bottom of the case.

Once the fob case has been open, you'll find an opening on either side of the case that houses the battery. Make use of the tape-wrapped flathead screwdriver to gently open the case, starting on one side before moving to the opposite. Remove the old battery, and put in the new CR2025 to ensure that it's in the right orientation for the correct orientation. Attach the cap to the battery again and secure both sides of your key fob case by pressing until they click.

After replacing the battery after replacing the battery, lock and unlock your doors to ensure whether the fob works. If everything seems to be in good order you're good to go. Mazda 3 remote features can be used again.

Pairing Issues

This could indicate that the transmitter in your car may have been damaged. It is typically a need for the assistance of a professional for repair and may require a new replacement key fob.


If you have tried replacing the battery and programming the key fob, but it has not solved the problem it could be that the chip in the key fob is malfunctioning. This can happen when the key fob has been dropped on hard surfaces and exposed to salt water or even touched by dirty hands.

To determine the cause of the issue To determine the cause, you must locate a small "key" built into the fob's seam that allows you to open it and take out the circuit board. You can then check the chip for corrosion or damage. To prevent damaging the microchip, it is best to use a fresh paper towel.

It is also possible to take a close look at the battery connector's terminals to see if they are damaged or cracked. If this is the case, carefully reconnecting them can generally restore the functionality of the key fob. Additionally, you can look at the buttons to see whether they're worn or damaged. If mazda key replacement are loose, they can easily be soldered back in place as well unless the button is actually snapped off.

Interference Signals

There are few things more frustrating than trying to start your car only to see the message "No Fob Detected". It happens at the worst time, for instance when you're late for work or you're trying to collect your children from daycare/school. There are several things you can do to find out what's causing the issue.

Interference signals can cause the remote key fob not to function in a proper manner. This can be caused by objects such as weather conditions, buildings and transmitters that operate on the same frequency. Interference can also occur when you have aftermarket equipment installed in your vehicle that transmits at the same frequency as the key fob.

The key fob may also be damaged if exposed to water or salty water. The rubber seals on the chip's electronic components can be penetrated by water, particularly when it is submerged for long periods of time such as in a swimming pool or at the beach. The chip could stop working and require replacement of the keyfob. If you have a programmable key, you can clean the chip with isopropyl alcohol or an electronic cleaner to help it come back to normal. If this does not help, the chip is likely fried and will need to be replaced.

Locking and unlocking of the Doors

The buttons on the key fob transmit electronic signals to the solenoid inside the car. It then converts that signal into mechanical action that locks and unlocks doors. If the door lock isn't working, the problem could be a solenoid malfunction that requires some analysis with the help of an expert repair shop for autos.

A dead 12 volt battery can also prevent the fob from functioning properly. This could happen if the battery fails to charge or if your contacts become corrosion-prone. The good news is that a new battery is able to fix this problem in just minutes.

If the key fob doesn't work after you change the battery or try to re-program it then the problem may be with the receiver module. The device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. If it malfunctions, it can be expensive to fix.

To confirm if this correct, place your spare key into the key slot. Then, turn the ignition ON. Press the key fob twice within 10 seconds, without removing it. The Mazda 3 system will now sync the key to the car and allow you to use it as your primary remote for driving. This allows you to program up to three keys.